The effects of overageing (OA) and vanadium addition on microstructure and properties of cold-rolled low-carbon Si-Mn dual phase (DP) steel sheets are studied. The results show that the microstructure and mechanical properties of DP steels are greatly affected by OA temperature. When OA is done at low temperatures (473 -573 K), the elongation rate increases sharply while both the yield strength and tensile strength decrease significantly. When OA is done at high temperatures (>573 K), the elongation does not further increase, but the yield strength ificreases and tensile strength decreases, which deteriorates the mechanical properties of the steel. The results also show that both the strength and the tempering stability can be significantly improved by vanadium microalloying. Fi-nally, the optimum OA temperature for the traditional steel appears to be around 523 K, while it is around 573 K for the V-containing steel, resulting in the best overall mechanical properties.
参考文献
| [1] | HE Ze-fu;XIA Jing;QIAN Xiao-rong.Microstructure Observation of Si-Mn Duplex Phase Steels[J].Journal of Chongqing Jianzhu University,1985(01):83. |
| [2] | Kot R A;Bramfitt B L.Fundamentals of Dual-Phase Steels[M].Warrendale:Metallurgical Society of AIME,1981 |
| [3] | Takasaki J;Irie T;Haga T.Production of 35 245 kgf/mm~2 Cold Rolled High Strength Steels With Excellent Press Formability by Continuous Annealing[J].Tetsu To Hagane-Journal of the Iron & Steel Institute of Japan,1982(09):150. |
| [4] | 蒋俊华,李俊,胡文彬.超高强低碳Si-Mn冷轧双相钢的回火组织和力学性能研究[J].金属热处理,2007(09):14-18. |
| [5] | 朱晓东,王利,季思凯,王聪.过时效对低碳Si-Mn双相钢性能和组织的影响[J].材料热处理学报,2003(02):50-54. |
| [6] | 朱晓东,王利,俞宁峰,季思凯,王聪.过时效和平整对冷轧双相钢板强度、塑性及烘烤硬化性的影响[J].钢铁研究学报,2003(06):47-50. |
| [7] | 邝霜,康永林,于浩,刘仁东,严玲.回火对C-Si-Mn系双相钢组织与性能的影响[J].钢铁,2008(03):77-80. |
| [8] | MA Ming-tu;WU Bao-rong.Dual-Phase Steel[M].北京:冶金工业出版社,1988 |
| [9] | XU Zhou;ZHAO Lian-cheng.Principle of Solid-State Phase Transformation of Metals[M].北京:科学出版社,2004 |
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